Malicious PDF — malware analysis report

Static analysis result for SHA-256 d624dc517122da44…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 19:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ca9d96e8a3629df40cf7943cd21480f SHA-1: 3621a39e711056f4dbb2cf24b477743b977fa284 SHA-256: d624dc517122da4400b3bfb72a626f38e2caef7225079419f3c11ef26aafc049
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, some of which point to other PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a72d022---97184556885.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/naguxaxugawow.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/47580457863.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/kibuvafurawolumegateva.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/88203115589.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/tawizivelefonumepoxaxaju.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/9171897891.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/wekogiwomuwonomij.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///42723823173.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/95225873055.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/dusulineruwizu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3q6rs8p6sq11bqmcqo7rqvo2je/60295783171.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/54637517694.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/78590644548.pdfIn PDF document text
    • http://sinners-party.de/media/file/dedisewo.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/tedirezawatuwakabunuze.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/26508881716.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/sulakit.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/55760552380.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/62271813527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=install+kodi+on+firestick+with+all+addonsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 17700 bytes
SHA-256: 0a2d2dcfd18ad52dc87caa30968d545435ccfaa071a3af8ed5005fdb2f40e06c
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10704 bytes
SHA-256: f7703f6e05aa3a76365120969dfeac35d3cb1a5d87df8490f95146f79fe732cb
font_02_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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